This article intends to give the reader a brief introduction on how to install and configure the EPEL upstream version of the NRPE agent on CentOS/RHEL 6 and 7.
Historically, op5 has compiled and packaged the NRPE agent for a large number of Linux distributions, but as per Q2 2014 we stopped doing this since it required a lot of maintenance and time. More information on this decision can be found here: https://www.op5.com/blog/blogs/op5-developers-blog/deprecation-notices-q2-2014/
1. Add the EPEL repository
CentOS 6 and CentOS 7:
2. Install NRPE and the plugins that is required to add the services via the function "Add UNIX client services" when adding a new host in the configuration UI in op5 Monitor
3. Configure the agent to utilize the plugins using commands supported by op5 Monitor host scan.
Create a new file called /etc/nrpe.d/op5_commands.cfg containing the following information:
These paths to the plugins should match the paths to the installed plugins in step # 2.
4. Now edit /etc/nagios/nrpe.cfg and add your Monitor server(s) address(es) to the allowed_hosts parameter as a comma-separated list, example:
5. Restart the nrpe agent on the host, and make sure that nrpe is started at boot:
Now you can add the services via the function "Add UNIX client services" when adding a host in op5 Monitor.
Linux server monitoring with SNMPv3
An alternative path as we recommend today is to use the SNMP (v3) protocol to monitor Linux hosts for added security. You can find how to setup that here: Monitoring Linux/Unix servers via SNMP